Lens-surfacing machine



Feb. 14, 1928.

A. E. MAYNARD LENS SURF ACING MACHINE Filed June 28, 1924 3 sheets sheet l INVENTQR (1.8. Maynard- BY W Feb- 1,659,277 A. E. MAYNARD LENS SURFACING MACHINE? Filed June 28, 1924 3 Sheets-Sheet Z INVENTOR TT NEY v A. E. MAYNARD LENS SURFACING MACHINE Filed June 28, 1924 3 Sheets-Sheet 5 I +++J-+++++++l +++l-+++++++i++++++++++ o i+++i m a INVENTOR (lcimaynard.

NEY

Patented Feb. 14, 1928.

' UNITED ,SJTAES ALBERT E. MAYNARD, or SOUTHBRIDG'E, OPTICAL COMPANY, or soo'mnnlnen,

anon on massncnnsar'rs.

The present invention relates to an improved ophthalmic lens surfacing machine, and has particular reference to a machine whereina pair of opposed spindles are em ployed, one of which is adjustable with respect to the other, the said machine includingmeans toindicate the relative position of the Opposed spindles.

An important object of the invention is to or poliShQd accurately in a minimum amount of time. I i ,Another important Object of the invention is to provide a lens surfacing t'ool including a pair of opposed spindles, one of which is adjustable with respect to the other, having indicating means for determining the exact correctirelative positions of the opposed spindles, both for the surfacing of positive and negative lenses.

'Other objects and advantages of the in vention will become apparent during the course of the. following description.

In the drawings, wherein like numerals are employed to designate like parts 5 throughout the same Figure 1 is a perspective view'of a lens surfacing machine employing my invention;

Figure 2 is a top plan view thereof; Figure 3 is a fragmentary elevation of a portion of the'machine;

Figure 1 is a fragmentary detail showing thevarious adjustments of the machine;

Figureojshows the construction of one portion of the indicating means employed; Figure 6 is a diagrammatic view of the nd c ing e n Figure 7 is another diagrammatic view; Figure 8 shows a differentadjustment; Figure 9 shows still. another adjustment.

' In the drawings, wherein for the purpesesof illustrationis shown the preferred m odimen otthe n e o the mera 10 designates the base of the machine which supports the standard 11 at one end and the Application filed June 28, 192 1. Serial No. 722,983.

MASSACHUSETTS, ASSIGNOR T0 AMERICAN LENS-SURFACING MACHINE.

rotary surfacing tool 12 at the other end. A pulley 40 i rotates the shaft, the said shaft having con nection with the lap 12 to positively drive the same. a

The standard llsupports the cross arm 13, through which runs a shaft having connection with the lens driving portion 14 which carries the crank'pin 15, having engagement with a block 16 adapted to support thelens 17 to be surfaced.

A shaft 18 runs through the sleeve 19, Figure 6, the said sleeve being pivotally connected to the standard by means of the pin 20, Figure 1. The shaft 18 is rotat ably supported within the sleeve 19 and is alsoadapted to be swung with the sleeve 19, which is swung about the pivot point 20. To facilitate this swinging motion, a universal connection is employed in the shaft, the said connection not'beingshown.

The head 21 supports one end of the splined shaft 22 which shaft drives the crank pin 15. A suitable slide section 23 is carried by the cross arm 13 to which it .is secured, which slide includes the graduations 24 to indicate units of movementof the head 21 with respect to the shaft 18. An operating lever 25 is employed to move the head 21 to and from the vertical shaft 18 through the link 42 which slidesin the slide'section 23, while the graduations 24 on the link 42 willindicate the exact adjust ment of the head 21 with respect to the vertical shaft 18. The threaded shaft 26 is adapted to be run through the ears 27' to maintain this adjustment by tightening the member 13 on the shaft 22. The markings 2% on the members 13 and 42 are arranged to indicate the distance fromthe shaft 18 to the center of the shaft in the head 21. It will be notedthat some of the figures of the scale are minus and some plus. If the scales be adjusted so that the plus 10 is aligned with the plus 10 on both scales the distance is correct for a plus 10 tool or curve that is to be ground. The other adjustments are made in a similar way, plus to plus or minus to minus, as required. The scale, therefore, indicates both the characters plus or minus and the power of the tool or curve to be made. When the head 21 is adjusted in this way there will be no chattering in the surfacing operation.

PATENT OFFICE.

keyed to the shaft 41 which e new Figure? g e vpbintergl'iis/earriedfbyl theswin'gingljcrossheadi 13 endiieadaptedn w T I slightgiepacect relation.theret0.;- ,The

the drawihg s, 'a c'o'n'cavo-con'vex' plate 28' having preferably a spherical curved -sur not intersect atsome positionithe curvature to be moved-ever the "curved plate 28' b :ked "as: is clearly showi finf Figure w d iewings, 'so' that the po nter; pan he moved :to anyione-- Of the designations Ton *pes ition :fdr a; lens t0,.be ground Or polished to the plewer designated 0n,-,the,p1ate. 28 i. It

'i is toiv be iinderstpodihat theiplzite 28 i'setek tion'riy," bei' 'g ii ouiited on the" ,steirderd 2'11,

while lthe,tppinter is ed zipted teb e sinOv hle oyerrthe plz terltoi the desired @dsighfition Fer iiistziiiee,j iii' Figiire fgl.ithe pointer is r set, for 'griiidiiig 1 polishing ;.a,, ninus 4 di0pter lens. -,It WiI-If irtherybe understoodthat twqfadjiist mente are made in a. single" voperatiqii vnamely, the necessary swinging ofgthesleeve and ehaftyl8 and;l9; {respeg i tiv e1y5and also, the.neceest ry rgtet-ioii lefth VerticaL-V ha'ft lS Within, the. [sleeve 19;. supplementary adjt stmentjeen v heyiriade by 1 meanszqf the slide 23hr; the croes armie and he'adf21. Theffgrachiatio is b rtheislide 23 "are zilsb' such "that they niaiy beiset, de

grQu'iid orpoliehech'fhut the iewerf ei th arm 23 ,sho'ul 1 cprrespo'rid t9 5 the sg'ett i g or I, With my; .cio iistruc ti'diijthei easily set for any d esired p ower 10f 19155 by 1 merely moving the pointer 31 OYQI. the, deg

,sired graduation 10111116 phmte 28, .et whieh I} adjustment ,thea'iiiachineLw-ill be accurately p esitio ned for that-particularlensg 7 After the necessary adjiietiheiithas been mede thehlleck levers 323ml 33 are tightened so to revent eccidental displejcement of theepi ndles after i the ii ece ssary .reletienship has been "ascertamed. Of c( urse,;t1 ie indicating mechanism the "partie iltr needs en, 2111 eiiiiilar i ieehi es'.

In the diagrammatic yiefwe Fig. fs hows apfrant v ewer of .the .i'ridieziter' plate; and e Idrigitudinal seetionhii line jA' lAl thereof,

the center of curvature being ab'oiitth'e ceii =01? mov'eme'nt'zih'outfthe pivot-[18 and? abo iit ir thiecel' fiel'20. theLVsai-d PIateaSdeSired. jT1 ieI,p1ate 'isfs o i graduated thetflthe end; ofthe vpointer -31 I may bemoved rte. any 'iie "Of the indicatiei e theree n: which will IQELUSQ-{t-IIQ ,s pin c 11ei 1 8 to: he rocked andntwisted toQtheeXaCt Correct rhin tis curve tool, Whereas Fig. 8- shows a similar View but ford, plus i-rve 112001; The ipositioiishown! iii. Fig: 6y is' thetpdsitionpf the toel iiidicated'in Fig. 117', while'ithatjsho'wn in ig.f8 the -positieii of the tool indieated in' Fig--9,;the t0o1*in Fig. i 7 having a CQRQHYQH surface and; the tool in Fig.1!) had- V iii'g" coiivex" surfac In Fig.-".5 the indicatie is on the scale,i igh ca te pqsitiqns for the varioustdlz fi fid a M Referring ti Figures 6,;7" Send grammatically illi strate sht h 13. 4 8., Gfthe "leiifs? epi'ndle in n 13 indicatesjtheengle at whiphfiheftqol is; setlete the ver tjicill; (O; 'iiidicjetes the g mp i' rei cureieiigrind brie 911 B a ngine;

le of, the; spind -driving the ti k 15.,ehou1 .i'ty; and quantity of lenses ,t j rniedf oijift-cdn greatly beimpr 'ved, while the ii 'achii ie It is w 'be ii'ndeif o ft t h '.--.if i the inve itipi herewithfehtiw je id d r bed ifs'it'o bejtalke i es" the; rpreferreel embpd ment" let the same arid that "x' ariqti s change si size, shape ;,2 1d arrange 'nfjent 6f 7 parts; V be fresortedpt'oj flWithOtlt departing fr 'm the spirit pith' iriv elltigiii orf the ecjo s ibjoined. claims 1 easily; be ,eoperatedliby mb stl- 2111' On 31.111} a de/vice ofthe cha reeter de ser ed; 7 the QQmbihatiOH with a lens gsufiaei g m'a' himi c di p r pp s indlee .0116 6f'WhiCh iS;Capabl efbein kedhn gul'arly and swting'late rallywith espeet to the other, of gin-indicator plate .carried;by' s'aicllj inachiiie, said plate? beiiig cprved;.,and, provided 7' with a iphimlitjr pf' suitable g};

ys'aid-ihw" 1 ti'j 'f if id fer f selective registrati'on Chine-[and zicla'pte'djfuppn I'IiOV inciyehle spindle" the combination with a lens surfacing inaposition designations, and means also car 10 the other, of an indicator plate carried by cate the degree of both rocking and swing centered about the center on which the spin- ALBERT E. MAYNARD.

2.'In a device of the character described, dle is rocked angularly and is provided with chine including a pair of opposed spindles, i'ied by said machine adapted upon moveone of which is capable of being rocked anment of said movable spindle for selective. gularly and swung laterally with respect to registration with said designations to iridisaid machine, said plate having a curvature ing movements of said spindle. 

